Trimming mechanism for sewing machines



Dec. 13, 1927. 1,652,413

. J.-c. RINGE TRIMMING MECHANISM FOR SEWING MACHINES Filed Aug. 8, 19242 Sheets-Sheet 1 INVENTOR J15) (Lei/ye ATTORNEY WITNES s Mm Dec. 13,1927.

J. C. RINGE TRIMMING MECHANISM FOR SEWING MACHINES Filed Aug. 8, 1924 2Sheets-Sheet 2 INVENTOR Join we; a

ATTORNEY Patented Dec. 13, 1927. o

UNITED STATES PATENT OFFICE.

JOHN C. RINGE, OF STRATFORD,

CONNECTICUT, A SSIGNOR TO THE SINGER MAN UFAC- TURIN G COMPANY, OFELIZABETH, NEW JERSEY, A CORPORATION OF NEW JERSEY.

TRIMMING MECHANISM FOR SEWING MACHINES.

Application filed August a, 1924. Serial No. 730,801.

This invention relates to improvements in trimming mechanisms for sewingmachines and has for its primary object to provide a trimming mechanismin which a reciprocatory trimmer blade performs its work-severing actionduring the effective action of the work-feeding means.

More specifically, the present invention has for an object to provide asewing machine having continuously effective workfeeding means withtrimming mechanism of the reciprocating-blade type, which trimmingmechanism is preferabl capable of being thrown into and out of e ectiveaction during the operation of the machine.

Another object of this invention is to provide a needle-feed machine, i.e., a machine wherein the endwise reciprocating needle has a lateralmovement in the line of seamformation while in the work, with a trimmingmechanism of the reciprocating-blade type which is effective to severthe work during the lateral feeding movement of the needle.

Other objects of the invention will be apparent from the followingdescription and claims.

The present improvement has been cm-' bodied in a continuous-feed sewingmachine substantially as disclosed in the U. S. Patent to H. Corrall andB. A. Stevens, No. 1,414,625, May 2, 1922, wherein the work iscontinuously advanced past the stitch-forming mechanism. The improvementcomprises a trimming mechanism of which the trimmer-blade has acutting-edge disposed to reciprocate in a plane substantially parallelwith the line of seam-formation. The trimmer-blade is carried by atrimmer-bar slidingly mounted for endwise reciprocation upon theswinging needle-bar frame, whereby during its work-severing action thetrimmerblade is vibrated laterally in timed relation with respect to andin the direction of the advancing movement of the work, i. e., in unisonwith the advance of the work. To reciprocate the trimmer-bar, it isreleasably connected with mechanism operated from the needle-barreciprocating shaft and when disconnected from its actuating mechanismthe trimmer-bar is raised by a spring into an inoperative position.

In the accompanying drawings, Fig. 1 is a longitudinal sectional view ofa sewing machine in which the present improvement which may beadjustable in any well known has been embodied. Fig. 2 is an end view ofthe needle-head of the machine with the face plate removed.

Fig. 3 is a longitudinal section of the head of the overhangingbracket-arm of the sewing machine.

Fig. 4 is a perspective view of the trimming mechanism. Fig. 5 is a planview of the throat-plate.

Referring to the drawings, the sewing machine shown is provided with abed-plate l, the upper surface of which serves as a clothplate. Risingfrom the bed-plate is the hollow standard 2, curving laterally into theoverhanging arm 3 terminating in the head 4. Suitably journaled in theoverhanging arm is the main or needle-reciprocating shaft 5 carrying atone end the belt-wheel 6 and at its opposite end the shaft-flange 7,provided with a crank-pin 8. 'Embracing the crank-pin 8 is the aperturedand laterally offset end of the link 9 of which the opposite end isconnected in a likeamanner with the stud 1O projecting from the collar11 suitably clamped upon the needle-bar 12.

The needle-bar 12 carries the needle 13 and is journaled for verticalreciprocation in spaced bearings, as 14, provided in the swinging frame15 pivotally supported at its upper end upon the stud 16 secured in thehead 4. In order to impart swinging movements to the frame 15, the lowerof the spaced bearings 14 is suitably connected with a crank-arm 17 onone end of the rockshaft 18, journaled in bearings provided in theoverhanging arm. The rock-shaft 18 is disposed substantially parallel tothe driving shaft 5 and has secured thereupon the forked arm 19 actuatedby the eccentric 20,

manner to vary the throw of the arm 19. Through the described operatingmechanism, the needle-bar 12 evidently receives endwise reciprocatingand laterally vibratory movements, the extent of lateral movement beingloo adjustable. The needle-thread take-up employed may be of anysuitable construction and need not be described herein.

Adjacent the eccentric 19 the driving shaft 5 carries a bevel gear 21meshing with a similar gear 22, carried by the upper end of a vertical,intermediate shaft 23, journaled at its upper end in a bearing providedin a lug- 24 upon the standard 2. At its lower end. the shaft 23 isjournaled in a bearing 25 formed in the frame of a housing 26 suitablysecured to the bed-plate 1. Within the opening 27 aiforded by the frameof the housing 26, the shaft 23 carries a worm 28 and a evel-gear 29.The worm 28 drives a worm-wheel 30 secured upon a substantiallyhorizontal feed-wheel actuating shaft 31 journaled at its rearward endin a bushing 32 suitably secured in an aperture provided in the frame ofthe housing 26. The bevel gear 29 meshes with a similar gear 33 carriedby the rearward end of the loop-taker actuating shaft 34 journaled in abushing 35 suitably secured in the housing 26. The opening 27 of thehousing 26 may be packed with lubricant and is closed by detachableplates 36 and 37 secured in any suitable manner upon the frame of thehousing. The lo0p-taker actuating shaft 34 extends substantiallyparallel to the driving shaft 5 and is journaled at its forward end inthe bushing 38 secured by set-screw 39 in a suitable a erture providedin a second housing 40. bevel gear 41 carried by the forward end of theshaft 34 and located in an opening 42 afforded by the housing 40, mesheswith a similar gear 43 suitably secured upon a vertical loop-takercarrying shaft 44. The shaft 44 is journaled for rotation in the housingand at its upper end carries a loop-taker 45 of a well known typecontaining a mass of under thread around which the loop of needle-threadis cast. The bevel gears 41, 43 are of a ratio whereby the verticalloop-taker shaft receives tworotations to one rotation of its drivingshaft.

The forward end of the feed-shaft 31 is journaled in the housing 40 andcarries a spur-gear 46 meshing with a similar gear 47 from which thefeed-wheel 48 derives continuous rotary movements during the operationof the machine. The supporting means for the feed-wheel may be of thesame character as that fully described in the prior Patent No.1,414,625, before referred to, said feed-wheel 48 projecting through aslot in the throat-plate 49 to engage and advance the work. Opposed tothe feedwheel is a rollerresser 50 carried by the lower end of apresser-bar 51, journaled for endwise movement in the head 4 and whichPresser-bar may be depressed in any suitable manner to cause saidroller-Presser 50 to 1yieldingly engage the work.

eferring now more particularly to the present improvement, the rear sideof the swinging frame 15 is provided with spaced flat-surfaced lugs, as52, providing slideways for the lateral ears as 53. of a trimmerbar 54,said ears having vertically disposed elongated ide-slots, as 55. Thetrimmerbar is guided for endwise reciprocatory movements upon the frame15 by screws, as 56, passing through the guide-slots and threaded intothe lugs 52, and is further guided by a lateral extension 57 of theframe guide-bracket 58. To the lower end of the trimmer-bar 54 atrimmer-blade 59 of the chop-trimmer type is secured by means of screws,as 60, for lateral adjustment, 9. finger-piece 61 being suitably securedupon the trimmer-blade to facilitate manual depression of thetrimmer-bar into operative position. The trimmer-blade 59 is providedwith the usual inclined cuttin edge 62 and with the guide-projection 63,t e latter in the operative osition of the blade entering an elongatedslot 64 rovided in the throat-plate 49. The blade-e ge 62 cooperateswith the edge 65 of a defining wall of the slot 64 in the throat-plate,said edge 65 constituting in effect a ledger-blade. A spring-pressedfollower 66 pivotally supported on the throatplate and which may be ofany usual form is preferabl employed to close the slot 64 in the raise'position of the trimmer-blade.

At its upper end, the trimmer-bar 54 has a ball-joint connection 67 witha slide-bar 68, confined to endwise movement in the head 4 and carryingat its upper end a lateral extension 69 overlying a rod 70. Z0 isjournaled for endwise movement within the hollow upper end of theresser-bar 51 and is normally urged upwardly by a spring 71 within saidPresser-bar, whereby when the trimmer-bar is disconnected from The rodits actuatin mechanism, it is lifted to and f yieldingly eld in aninoperative position determined by the engagement of the lower ends ofthe slots 55 with the screws 56.

In order toimpart endwise reciprocatory movements to the trimmer-bar 54upon the vibratory frame 15, said trimmer-bar is provided with a slot 72adapted to be entered y a roller 7 3 carried by t e free end of an arm74 extending laterally from one end of a rock-shaft 75. This shaft 75 is'journaled for rocking and endwise slidin movements in bearing lugjs, as76, provide on the rear side of the r Suitably secured upon therock-shaft 7 5 is an arm 77 havin acket-arm of the machine.

a fork straddling an ec-I centric 78 upon t e main-shaft 5 of the ma-'chine. The 'rock-shaft-75 may be shifted endwise to connect anddisconnect the roller} i 73 from the trimmer-bar and to this end thereis provided a manually operable leverflv 79, 80 secured u on afulcrum-pin 81 jour-' of said lever extends forwardly underneath nale'dupon the racket-arm 3. The 'arm179 the bracket-arm 3 for convenientmanipula'r tion thereof, and the other arm 80 of said 5 r lever isengaged y a Spring 82 functioning A to yieldingly maintain connected thetrimmer-bar and its reciprocatin mechanism.

Projecting from the arm 79 0 said lever is a forked lug 83 straddlingthe grooved end of the shaft 75, whereby movements of said lever 79, 80are transmitted to the rock-shaft.

During the endwise movements of the rockshaft, the forked arm 7 7 slidesupon the eccentric 78 and consequently the shaft 75 is constantlyrocking during the operation of the machine regardless of whether or notthe trimmer-bar is connected therewith.

The present improvement evidently retains all of the advantages inherentin a trimmer of the reciprocating-blade type and overcomes thedifficulty heretofore present in this type of trimmer in that it mayeffect its work-severing action in unison with the feed of the work byreason of the fact that the trimmer-blade is vibrated laterally duringits work-severing action in the direction of movement of the advancingwork.

Having thus set forth the nature of the invention, what I claim hereinis 1. In .a sewing machine, in combination, stitch-forming mechanismincluding a reciprocatory needle, means for reciprocating said needle,means for continuously feeding the work during the reciprocations ofsaid needle, an endwise reciprocatory trimmerbar, a trimmer-bladecarried by the trimmer-bar, and means for reciprocating said trimmer-barindependently of the reciprocations of the needle during the action ofsaid work-feeding means.

2. In a sewing machine, the combination with stitch-forming mechanism,work-feeding mechanism including a work-advancing feed-wheel, and meansfor continuously rotating said feed-wheel to continuously advance theWork during the operation of the machine, of an endwise reciprocatorytrimmer-blade, means for reciprocating said blade to effect awork-severing operation, and means for laterally vibrating said blade inthe direction of feed during the worksevering action of said blade.

3. In a sewing machine, the combination with stitch-forming andwork-feeding mechanism including an endwise reciprocating needlelaterally movable while in the work in the direction of the line ofseamformation, and means for actuating said needle, of a reciprocatorytrimmer-blade having its cutting edge disposed substantially parallelwith the line of seam-formation and laterally movable during itswork-severing action in unison with the advance of the work, and meansfor reciprocating said trimmer-blade.

4. In a sewing machine, the combination with stitch-forming andWork-feeding mechanism including a work-penetratingendwise-reciprocating needle laterally movable while in the work in thedirection of the line of seam-formation, and means for actuating saidneedle, of a chop-trimmer for severing the work, and means for actuatingsaid trimmer to effect its work-severing action during said lateralmovements of the needle.

5. In a sewing machine, in combination,

stitch-forming mechanism including a reciprocatory needle, means forreciprocating said needle, means for continuously feeding the workduring the reciprocations of said needle, a trimmer-blade carrying bar,a vibratory frame upon which said bar is mounted for endwisereciprocation, means for vibrating said frame in the direction of theline of seam-formation, and means for reciprocating said bar upon saidframe.

6. In a sewing machine, in combination, stitch-forming mechanismincluding a needle-carrying bar, a vibratory-frame upon which saidneedle-bar is journaled for endwise reciprocation means for vibratingsaid frame, a trimmer-blade carrying bar mounted upon said frame forendwise reciprocation, and means for reciprocating the trimmer-bar.

7. Trimming mechanism for sewing machines comprising a trimmer-bladecarrying bar, a vibratory frame upon which said bar is mounted forendwise reciprocation thereupon, means for vibrating said frame in thedirection of the line of seam-formation, means for reciprocating saidbar upon said frame, and means for throwing said bar into and out ofoperation independently of the vibratory movements of said frame.

8. Trimming mechanism for sewing machines comprising a trimmer-bladecarrying bar, a vibratory frame upon which said bar is journaled forendwise reciprocation, means for vibrating said frame in the directionof the line of seam-formation, means for reciprocating said bar uponsaid frame, and manually cont-rolled means for disconnecting said barfrom its reciprocating means during the operation of the machine.

9. Trimming mechanism for sewing ma chines comprising a trimmer-bladecarrying bar, a vibratory frame upon which said bar is journaled forendwise reciprocation, means for vibrating said frame in the directionof the line of seam-formation, means for reciprocating said bar uponsaid frame, manually controlled means for disconnecting said bar fromits'reciprocating means, and yielding means for shifting thedisconnected trimmer-bar into an inoperative position.

10. In a sewing machine, the combination with stitch-forming mechanism,and workfeeding mechanism continuously advancing the work during theoperation of the machine, of a trimming mechanism including atrimmer-blade moving laterally during its work-severing action in unisonwith the ad Vance of the work under the action of said work-feedingmechanism and means for actuating said trimmer-blade.

In testimony whereof, I have signed my name to this specification.

JOHN C. RINGE.

